CVE-2024-38533Network attack vector

Invalid stack access via unconverted pseudo-select addresses

Published Jun 28, 2024 · Updated Aug 2, 2024

Out-of-bounds write in Matter Labs ZKsync Vyper Compiler before 1.5.0 allows attackers to trigger invalid stack access. The EraVMBytesToCells pass fails to convert byte-addressed stack operands in pseudo select instructions into 32-byte cell addresses. Reachability requires assembly containing stack[rN] without a context.sp, shr.s 5, or div.s 32 definition; Matter Labs reported no affected contracts at publication.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in Matter Labs ZKsync Vyper Compiler before 1.5.0 allows attackers to trigger invalid stack access. The EraVMBytesToCells pass fails to convert byte-addressed stack operands in pseudo select instructions into 32-byte cell addresses. Reachability requires assembly containing stack[rN] without a context.sp, shr.s 5, or div.s 32 definition; Matter Labs reported no affected contracts at publication.

The record

CVE
CVE-2024-38533
Published
Jun 28, 2024
Updated
Aug 2, 2024
Vendor
Matter Labs
Product
ZKsync Vyper Compiler
Classifications
CWE-787
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.5.0
  2. Affected versionversion=< 1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Matter Labs · ZKsync Vyper Compilerversion=0 <1.5.0; version=< 1.5.0

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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